class Byebug::DeleteDisplayCommand

def description
  %{undisp[lay][ nnn]
    Cancel some expressions to be displayed when program stops. Arguments
    are the code numbers of the expressions to stop displaying. No
    argument means cancel all automatic-display expressions. "delete
    display" has the same effect as this command. Do "info display" to see
    the current list of code numbers.}
end

def execute
  unless pos = @match[1]
    if confirm("Clear all expressions? (y/n) ")
      for d in @state.display
        d[0] = false
      end
    end
  else
    pos = get_int(pos, "Undisplay")
    return unless pos
    if @state.display[pos-1]
      @state.display[pos-1][0] = nil
    else
      errmsg "Display expression %d is not defined.\n", pos
    end
  end
end

def names
  %w(undisplay)
end

def regexp
  /^\s* undisp(?:lay)? (?:\s+(\S+))? \s*$/x
end